Sciatica vs. Piriformis Syndrome: How to Tell the Difference
If you've ever had a sharp, burning pain shoot from your buttock down the back of your leg, you've probably been told it's sciatica. And it might be. But there's another condition that looks almost identical on the surface, produces nearly the same symptoms, and requires a completely different approach to treat. Getting this wrong doesn't just slow your recovery. It can make things worse.
Here's how to tell the difference between true sciatica and piriformis syndrome, and why it matters.
What they have in common
Both conditions involve the sciatic nerve. The sciatic nerve is the longest nerve in the body, running from the lower spine through the buttock and down the back of each leg to the foot. When it gets compressed or irritated anywhere along that path, you feel it. Pain, tingling, numbness, and weakness in the leg are common to both conditions, which is exactly why they get confused so often.
The key difference is where the problem is originating and what's causing the nerve irritation in the first place.
Side by side
The symptoms overlap heavily, but the origin, the aggravating factors, and the clinical findings separate them.
What sciatica actually is
True sciatica, more accurately called lumbar radiculopathy, begins at the spine. A nerve root in the lumbar spine gets compressed or irritated, usually from a herniated disc, degenerative disc disease, spinal stenosis, or a bone spur. That compression sends pain, tingling, or numbness along the nerve's path down the leg.
The pattern tends to follow a specific route depending on which nerve root is involved. L4, L5, and S1 are the most common. Pain typically originates in the lower back and radiates down through the buttock and into the leg. Coughing, sneezing, or prolonged sitting can aggravate it. In more significant cases you may notice weakness in the foot or altered reflexes, signs that point clearly toward a spinal origin.
What piriformis syndrome actually is
Piriformis syndrome is a different problem entirely. The issue here is not in the spine at all. The piriformis muscle, a small deep muscle that sits in the buttock and controls hip rotation, either spasms, tightens, or becomes irritated and compresses the sciatic nerve where it passes close to or through the muscle. This is an extra-spinal cause of sciatic nerve irritation, meaning the spine may be completely fine.
The pain in piriformis syndrome tends to be concentrated deep in the buttock, often described as a deep aching or burning sensation that may radiate down the leg but doesn't always originate clearly from the lower back. Sitting for prolonged periods typically makes it significantly worse. Many people feel relief when they stand up and move around. Tenderness directly over the piriformis muscle in the buttock is a common clinical finding.
How we tell the difference clinically
This is where a thorough assessment matters. There are specific clinical tests that help differentiate between the two.
For piriformis syndrome, the FAIR test places the hip in flexion, adduction, and internal rotation to compress the piriformis against the sciatic nerve. Reproduction of the familiar buttock and leg pain is a positive finding. Direct palpation of the piriformis muscle in the buttock often reproduces symptoms as well.
For true sciatica, the Straight Leg Raise test places tension on the lumbar nerve roots. Pain that reproduces down the leg below the knee at a low angle of hip flexion is a strong indicator of spinal nerve root compression. Neurological findings like reduced reflexes, objective weakness, or dermatomal numbness point more definitively toward a spinal cause.
Imaging tells part of the story but not all of it. An MRI can confirm a herniated disc or spinal stenosis but piriformis syndrome is typically a clinical diagnosis. Two people can have identical MRI findings and completely different symptoms, which is why the hands-on assessment is what actually drives the diagnosis here.
Two people can have identical MRI findings and completely different symptoms.
Why the distinction matters for treatment
These two conditions require fundamentally different treatment approaches. Treating one as if it were the other is a common reason people don't get better.
For true sciatica, the focus is on reducing compression at the nerve root. Spinal manipulation, traction techniques, nerve mobilization, and anti-inflammatory strategies are typically effective. Activity modification matters, and understanding which positions load the disc or narrow the spinal canal helps manage symptoms during recovery.
For piriformis syndrome, the target is the muscle itself. Dry needling directly into the piriformis is one of the most effective interventions we have for releasing the muscle and reducing pressure on the sciatic nerve. Soft tissue work, targeted hip mobility, and progressive strengthening of the hip and gluteal complex address the underlying dysfunction that created the problem in the first place.
The good news is both conditions respond well to conservative care when the right diagnosis is made and the right treatment is applied.
Pain down the back of your leg?
Book an appointment and we will run the tests that separate these two before starting treatment.